Find the Runner Up

JavaScript

const findTheRunnerUp = (arr) => {
    if (arr.length === 0) {
        return;
    }
    arr = arr.sort((a, b) => b - a);
    let i = 0;
    let runnerUp;
    for(let j = 1; j < arr.length; j++) {
        if (arr[i] !== arr[j]) {
            runnerUp = arr[j]
            return runnerUp;
        } else {
            i++;
        }
    }
}

let array = [2, 3, 6, 6, 5, 6, 6, 2, -22];
console.log(findTheRunnerUp(array))